SummaryBackground: Cardiac troponins are very sensitive and specific indicators of myocardial damage; however, they are sometimes found to be increased in patients with end-stage renal disease (ESRD).Hypothesis: The aim of this study was to determine cardiac troponin I (cTpI) and creatine kinase myocardial isoform (CK-MB) levels and to assess their diagnostic and prognostic importance before and after renal transplantation.Methods: Thirty-four patients with ESRD (mean age 31.8 ± 8.6 years, 11 women) were enrolled. Serum levels of cTpI and CK-MB were measured pre-and postoperatively on Days 1, 7, and 30. Patients were followed up for cardiac events, and possible myocardial damage was investigated by exercise thallium-201-labeled myocardial perfusion scintigraphy. Mean cTpI levels were 0.24 ± 0.11 ng/ml (preoperative), and 0.34 ± 0.27 ng/ml (Day 1), 0.26 ± 0.11 ng/ml (Day 7), and 0.28 ± 0.30 ng/ml (Day 30).Results: Compared with preoperative levels, cTpI was increased in 16 (47%), decreased in 6 (17.6%), and did not change in 12 (35.4%) patients. However, the increase did not exceed the myocardial infarction reference level of 2.3 ng/ml in any patient. Mean CK-MB levels were 12.6 (8.7U/l (preop-